Are there any outliers in the data? What does the outlier mean?
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The equation of the line is given as 
A straight line equation is given in the form
where 
is the gradient and 
is the y-interest.
We need to rearrange to make 
the subject.
⇒ from here we can read the gradient and the y-intercept. The gradient, 
and 
.
<span>A line that is parallel to
will have the same gradient, but different y-intercept. One example of equation of a line that is parallel to is 
</span>
A straight line equation is given in the form
We need to rearrange
<span>A line that is parallel to
</span>